In a large saucepan, mix the sugar, vinegar, cinnamon sticks and cloves. Boil 5 minutes. Pour the hot liquid over the pumpkin in the bowl. Cover and set aside 8 hours, or overnight.
Strain the liquid into a large saucepan. Boil 5 minutes. Remove the cinnamon sticks and cloves, leaving a few bits for decoration. Place the pumpkin back into the liquid and return to boiling. Boil 5 minutes, or until pumpkin is transparent but crisp. Allow the mixture to cool. Transfer to sterile jars and refrigerate.
